In the photoelectric effect ejection of electrons from the surface of a metal takes place when

Question

Question

This question was previously asked in

SSC CHSL Memory Based Test (Held on: 4 August 2023 Shift 1)

Answer 1

CONCEPT:

Photoelectric effect: When the light of a suitable wavelength is incident on the metal surface, electrons are ejected from the metal instantly. This phenomenon is called the photoelectric effect.
Stopping potential (V): The minimum potential required to stop the electron emitted from metal so that its kinetic energy becomes zero is called stopping potential.
Work function: It is the minimum amount of energy required so that metal emits an electron. It is represented by ϕ.

Albert Einstein equation for photoelectric emission:

h ν = ϕ + e V

Where, h = planks constant, ν = incident frequency, ϕ = work function, e = charge on an electron and V = stopping potential.

EXPLANATION:

From the above discussion, In the photoelectric effect ejection of electrons from the surface of metal takes place when Light of suitable wavelength falls on it. So option 4 is correct.